Study on E-field Coupling Characteristics in Time-domain and Frequency-domain of NEMP to Computer Case
In order to s tudy the time-domain and frequency-domain coupling characteristics of computer case to NEMP,the electromagnetic simulation software based on time-domain finite integral method is used to simulate the E-field coupling law of computer case with different aperture shape,aperture layout and different positions in the case.The results show that:the E-field shielding effec-tiveness of the case decreases with the increase of frequency,and reaches the minimum at the resonant frequency;when the aperture area is equal,the instantaneous E-field shielding effectiveness and the E-field shielding effectiveness of each frequency point are all optimal when the case adopts circular aperture and multi circular aperture array,the instantaneous E-field shielding effectiveness and the E-field shielding effectiveness of each frequency point increase with the increase of the distance from the aperture.The E-field shielding effectiveness in the electric field polarization direction increases slowly,The E-field shielding effectiveness in the non-polarization direction increases quickly.A reference for improving the shielding effectiveness of computer case and optimizing the reasonable layout of internal electronic devices and circuits is provided.
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